<template>
  <div class="com-container">
    <div class="com-chart" ref="rank_ref"></div>
  </div>
</template>

<script>
import { mapState } from 'vuex'
import { rankData } from "@/api/index";
export default {
  data() {
    return {
      chartInstance: null,
      allData: null,
      startValue: 0, //区域缩放的起点值
      endValue: 9, //区域缩放的结束值
      timerId: null, //定时器
    };
  },
  mounted() {
    this.initChart();
    this.getData();
    window.addEventListener("resize", this.screenAdapter);
    this.screenAdapter();
  },
  destroyed() {
    window.removeEventListener("resize", this.screenAdapter);
    if (this.timerId) {
      clearInterval(this.timerId);
    }
  },
  methods: {
    initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.rank_ref, this.theme);
      const initOption = {
        title: {
          text: "▎地区销售排行",
          left: 20,
          top: 20,
        },
        grid: {
          top: "40%",
          left: "5%",
          right: "5%",
          bottom: "5%",
          containLabel: true, //距离是包含坐标轴的文字
        },
        tooltip: {
          show: true,
        },
        xAxis: {
          type: "category",
        },
        yAxis: {
          type: "value",
        },
        series: [
          {
            type: "bar",
          },
        ],
      };
      //鼠标移入
      this.chartInstance.setOption(initOption);
      this.chartInstance.on("mouseover", () => {
        clearInterval(this.timerId);
      });
      //鼠标移出
      this.chartInstance.on("mouseout", () => {
        this.startInterval();
      });
    },
    async getData() {
      // 获取服务器的数据, 对this.allData进行赋值之后, 调用updateChart方法更新图表
      try {
        let result = await rankData();
        this.allData = result.sort((a, b) => {
          return b.value - a.value;
        });
        this.updateChart();
        this.startInterval();
      } catch (e) {
        console.log(e);
      }
    },
    updateChart() {
      const colorArr = [
        ["#0BA82C", "#4FF778"],
        ["#2E72BF", "#23E5E5"],
        ["#5052EE", "#AB6EE5"],
      ];
      //处理图标需要的数据
      const provinceArr = this.allData.map((item) => item.name); //所有省份生成的数组
      //所有省份对应的销售金额
      const valueArr = this.allData.map((item) => item.value); //所有省份值生成的数组
      const dataOption = {
        xAxis: {
          data: provinceArr,
        },
        dataZoom: {
          show: false,
          startValue: this.startValue,
          endValue: this.endValue,
        },
        series: [
          {
            data: valueArr,
            itemStyle: {
              color: (arg) => {
                let targetColorArr = null;
                if (arg.value > 300) {
                  targetColorArr = colorArr[0];
                } else if (arg.value > 200) {
                  targetColorArr = colorArr[1];
                } else {
                  targetColorArr = colorArr[2];
                }
                return new this.$echarts.graphic.LinearGradient(0, 0, 0, 1, [
                  {
                    offset: 0,
                    color: targetColorArr[0],
                  },
                  {
                    offset: 1,
                    color: targetColorArr[1],
                  },
                ]);
              },
            },
          },
        ],
      };
      this.chartInstance.setOption(dataOption);
    },
    screenAdapter() {
      const titleFontSize = (this.$refs.rank_ref.offsetWidth / 100) * 3.6;
      const adapterOption = {
        title: {
          textStyle: {
            fontSize: titleFontSize,
          },
        },
        tooltip: {
          axisPointer: {
            lineStyle: {
              width: titleFontSize,
            },
          },
        },
        series: [
          {
            barWidth: titleFontSize * 1.2, //宽度
            itemStyle: {
              barBorderRadius: [
                (titleFontSize * 1.2) / 2,
                (titleFontSize * 1.2) / 2,
                0,
                0,
              ],
            },
          },
        ],
      };
      this.chartInstance.setOption(adapterOption);
      this.chartInstance.resize();
    },
    startInterval() {
      if (this.timerId) {
        clearInterval(this.timerId);
      }
      this.timerId = setInterval(() => {
        this.startValue++;
        this.endValue++;
        if (this.endValue > this.allData.length - 1) {
          this.startValue = 0;
          this.endValue = 9;
        }
        this.updateChart();
      }, 1200);
    },
  },
  computed: {
    ...mapState(['theme'])
  },
  watch: {
    theme() {
      this.chartInstance.dispose()//销毁当前的图标
      this.initChart()//重新初始化图标
      this.screenAdapter()//完成屏幕适配
      this.updateChart()//更新图标展示
    }
  }
};
</script>

<style lang='less' scoped>

</style>
